Which of the plant hormones is most strongly associated with promoting leaf shedding?

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BlackTom AI · Accepted Answer

To tackle which hormone is most strongly linked to promoting leaf shedding, we should evaluate the roles of each option.
Option a: Cytokinins. These hormones are mainly known for promoting cell division and delaying senescence in leaves, which tends to keep leaves on the plant longer rather than promoting shedding. So this would work against leaf abscission rather than promote it.
Option b: Auxin. Auxin generally helps maintain organ integrity and suppresses abscission by reinforcing the connection between the leaf and stem. Higher auxin levels near the leaf base reduce the likelihood of shedding, making this option unlikely to be the strongest promoter of leaf drop.
Option c: Abscisic acid. ABA is a stress-related hormone that participates in processes like dormancy, stomatal closure, and the induction of senescence under adverse conditions. It can contribute to leaf senescence and, in some contexts, to abscission events, acting in concert with ethylene to promote shedding-related processes. While ethylene is the classic primary driver of leaf abscission, ABA’s role in promoting senescence and stress responses can support shedding under certain conditions.
Option d: Gibberellic acid. Gibberellins are mostly associated with growth promotion, elongation, and breaking dormancy, rather than promoting leaf abscission. They typically act to keep leaves growing and attached, not to induce shedding.
In summary, cytokinins tend to preserve leaves, auxin inhibits shedding, gibberellins encourage growth, and abscisic acid is linked to senescence and stress responses that can facilitate shedding; among the given choices, ABA is the one most aligned with promoting leaf shedding within the context of stress-induced or senescence-linked processes.

BIO1022 MA S2 2025 On Campus Test 2

Which of the plant hormones is most strongly associated with promoting leaf shedding?

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